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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd4fc35bc96c1d74c67f2b3c56d3ad5649ef2a966990511701922c1691b87b02' 
  AND token = 'PfmqK3tIPk4VLZR3VuVEvVWv/lui2AjACI7gRoPA0hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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