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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa4bb7aa13e19d85d1411c4a0617f88b40ada79c144b5c2c8fc1a6eff3e7adab' 
  AND token = 'jDz8ZylZzy2i//8iEdgeIKZ4wZgOxJuPYB0yBphEzfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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