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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46fb5930e8cdf7afbf747fe9bc45e77ac2a7be1a7f9700fa83896715615ad55e' 
  AND token = 'Pe0KV0/jcqqqBPtskwbkJ9z23SM/PY+I/nsFgV7Tyis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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