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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77daa923fd24b796640a61ce2ac92aaed9a5fc1dd3b163bb3418fe3dd65341be' 
  AND token = '45gNlnxeFVV9gj9HCwJfMPYZZJV2cZpK1A105ZkAnZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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