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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83dbe31bec26029e64ad2b9d672166f22ac56db1093ab56082a6caa0b170895' 
  AND token = 'MDp4RyU7uSeywG2AnSVIRJ+2mR1t73YBYxSvnJHrRW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00331

JSON explain

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