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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ed2923eb6a072b5b154f57f13838bbfe4edfd394a7067184ba050ed4b4216f1' 
  AND token = 'm2XXpkGrXG/TEVo8Ip3icclWf+9zdD+qBOdpW/N2NqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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