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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38f0318f4f5a42027b3c09952d4c13ac086e6a35c9733d81b85c2559d50a01be' 
  AND token = 'v125OFK6w6XqjOGbXXecf8z/ZlD8iDIzoRE9WwP3ZAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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