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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a18bb61816f7971160db5b1ad800d085c02510d0dee6ad486f5f846e67d086e' 
  AND token = 'yrl+DIzb4sFV8kARpDWjMK/uQ0u3JWr+Sp4r4/XiXX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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