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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fa1f49eeeaf0008a4a26bfba0e0c631ac88b9637e718d40473b2066a8696996' 
  AND token = 'kKLGrH9/D/V851C+a9+IM8mk/F6xVCkKPtUHR2qUXb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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