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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c4c1c22bc6d722990dbf8a73e1c17bd0b313b54d6aba4b21421682fd7e8c1f7' 
  AND token = '0VBnNMzv62uIxy8tyOXMkWyQa2rSFbTs6L9t/U1m7Q8=' 
  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"
    }
  }
}