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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2afe2be36d4efdff4a2274ad0ebe45a9eac8fd2f5d363773cc2c0f0c47892d9' 
  AND token = 'Dh5N+iRO3dTSX/Ova3J5wfOPgi3bnE2B0uM7+34XG8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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