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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aff8cd61d407bc540d3469c20db1b994c7854a57e503c54b75df9e2a44f877b' 
  AND token = 'o5Ax4wRWcyBSbSmQ90bhdfyRHDlymJpf6bj3/Pd6bu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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