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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3a50a6f9f36457198d3096615e0b24409d6ea6df04b29958d2e613093c0d3a7' 
  AND token = 'EAO/Mb7BjBY3RX3G26kxnPZ4wP6pCg4P9evEgHJ1Voo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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