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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1c3d79b64ff191afbf8ba0a0068cb0d9e34748f3da08048e7cc9310afeb29e2' 
  AND token = 'IGsw7Cn8I0WexRgLwzRBCbLxY0ApNvhZ+LJPKw9Nywc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00156

JSON explain

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