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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89d4c0efd8dac4b02ea80997586dc4291e6e7d0d0008bf44ffadaa742c270049' 
  AND token = '4hc1/8uRZIhHD5m9I8/+zg7UY3RWsfYTWfhlLE9u9nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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