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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90969efeec2b650269c0901ad018409fddc01f5b198dfdc1ec8c0ff76e990c1a' 
  AND token = 'H0i0Gx2CL7PrHOLyMCOwWaE+yF3Jkd+yHpMJD0T1jSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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