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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d2a7b48f08a30c68944db4485825eafe58785b2d23173f19f21f8f4e1dc47e' 
  AND token = '8OYT5SD4ZN4VgFP15PaZjh/8dt95o0jAXqlGk8kKXqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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