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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a48032699725ec6dd7da83faa957d4bffa1e6328f6fa596fcfe64a6efbb0434' 
  AND token = 'HCutjhR1KYyK6/ki/bCxfCN1kYN0u94XA/xxY75+Vrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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