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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ba7e5b73df1e5af904b048738ea28fdd17e1ae671a002d49db6c4620b88570' 
  AND token = 'mzkmBgaU65ieClB1xMRVPGu0ldxbig5EJU7i284ofAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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