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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc634ff90e401fdf8b73c79ada7fc795a00dd0d399eb397631a615df0457660' 
  AND token = 'LyL2ovf3yPhl4mZZZEIr9gXQFp9t0IwBcjg2+CD4sNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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