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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '694d58bfb217b8351025c8e84e7b14a13093228b540b5c2a22549b812e26d3c7' 
  AND token = 'gis9cKD/UpNHMXzLnSAQ79XukyeySoKvv507oM8gEm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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