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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fcb42b7f1ccc0417f50dd2b4d3034bd0ba64cf7499888a2da83c080b0b6b0da' 
  AND token = 'l5DrsExibNDVGTD3jRhmTq18YqSbbXR7KYHcWAEKgZ8=' 
  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"
    }
  }
}