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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49a58cbadbfd751f08f0fecbf639810d739ffcba8ce4eb08769cc5a9ce6d5fd7' 
  AND token = 'UwC4Kf967BTJzHYwPSoReffBMdm6jYpip/MI71cB5QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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