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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59538237e572f4c2fbbcae36c3da12a171c3ac144b1fd5c7336b7d3525e892b0' 
  AND token = 'i5b0lOxbpsKo3OU1I+Nx+mvKRKbUVu8xSvecfB8NNhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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