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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5e75c7542655e22a79a36fc7711ae21bcef44cd98f8622e6b71d2bdf095c1f2' 
  AND token = '8R9pm9En9juKs6eY37yc+4yt2n4VF+LHmVmcVm5pCyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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