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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff3f3059a13c02194a7a107c9f09ad113724440ed31870dadbd4849a56bd551' 
  AND token = 'qKy91POP2IvzPiCgyHT1Xldg73bgyn+N9hOEkqmMGp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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