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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '616452ae4d13c299cdf03f57c2bbbb68aa14b2524333a0be1a369ced992f8022' 
  AND token = 'WxSAR2OnNTmWcchHqvFJKo93vAqEpNStqdwknDKfuC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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