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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42e427a3cca3a1ec8d1b4e8fdd5b81932a477f8854871b3cb19b565187c3445d' 
  AND token = 'M/3Cm+75w+ly5bhsuSJi7zFFAVNieZ1zyaxopI1Z6io=' 
  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"
    }
  }
}