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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97521e70d2f3b69676077cc60b0808df902fd8230c46f25d66d88b2adb2699b5' 
  AND token = '6V6KV1v0VtuXcl9Pi7vb2UenDuAjRTjS+sCyaO3ROn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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