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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1306da0e41ea50f5b0d1d6d6f33ebbd79f350deea548424c1b38eda13eb0d553' 
  AND token = 'ZA79n5OZro9NDtM9VdEgNrP3vysDInjRRgXGRve3KjA=' 
  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"
    }
  }
}