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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '975b37fb634d918b1823310e97d975d4e6c00289d95f6089e85e9346f6277e11' 
  AND token = 'ULv1QW2l9XNo51FVlgygPoVAszq4UHa0C+CaehVjyHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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