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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ed6a57d0f2199e661529009b22dba93803f7baa23e1f5f0e7e4f467661d1bf7' 
  AND token = 'ClWRFe3MTQ6BEfbhKYqiKr9jlNUCjx7ekTWcmNZ06Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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