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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'decc376c34cbd8b31c0335b2fba932388d4e33c53892f98d9f62417a57b768b5' 
  AND token = 'ivu1N5/NCCEadvHs/ssdieofK0tmZ6hBjkZ7aDoO9UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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