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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca32e1426f22e0d9a9ea2978a5bd9a735f5a892951eb62b666ec6055e7edadf' 
  AND token = 'JEPh+nJGp9Ro0TUpj/TvrhibQuPysDSneuP3NItu8t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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