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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e951767ff069a8f9d7d9e10abf830deb65be1a97a1698b0604e163d345d30086' 
  AND token = 'SS/KLt5Tn76na6GJA4tZu2LWEKPdbvU2DnkC0lNOGDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}