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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '118de27a2875ad6b54b3a7050ce85dd54993c22fc80d392c88bae289d1cd3a35' 
  AND token = 'IvVitBD63ZSjEzMtZO3Rb6Lof0qi21GrgGovgi349RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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