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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec135a85f4ffbd5ff668dfdd93d6ceb995304b5b5e3aa7763912c041ce23692' 
  AND token = 'uyfEZbEjdM/N1y/vSQxqx30An8sQas+9/Qt743vv37E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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