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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0fe41ee5f4c1e99595b3d42de0664ec1785913988df2b91aa57f996efb916b0' 
  AND token = 'Ce5SAE8hntxb8ldVWHIKb9CbiGbN7/EKCie8ziwgUXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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