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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6099a07bac24f6fe2d02355f1dbca1a07745dce993933101edbc4d0d787fe349' 
  AND token = 'q/7SsxGiVF2+hObU4CT+P7q8trMLhwuoQM4jICfspj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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