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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42dd27119d0316f7d2b07be4ca0a4168c6b2b516c2cd65ef815e55ae2e983bf5' 
  AND token = '8oFMbRl+rP4asEcausxTw96ACPOgNU0jwIBZZF0vGXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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