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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be67f29e488b0aa1ebfec737d8d8a8b54fc70d35ba5e157111be27001fbc04e' 
  AND token = '7o04MrsjnvNW5TiV6A8cBjoT45Q4Uccmfr8CJD4g8YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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