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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb4e31b870785b939276ccc16b52f7a0eca8f76f47aa2990c0e7152fc3f7eb7' 
  AND token = 'J595EDS1Me9M4UAU/dla5wdjaRfWPI9O3r2b5kcmQNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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