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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0b0c447879901fc4756a1b76fd6462525cabe3a4e2ec25d134e9c0aa3f156f4' 
  AND token = 'KPuACblODFWeUwuEhT5gYifLbG0C3Cd4HFITf9TZ6kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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