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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9887c5db3c4986fe229e369665548139e136d7e03606c6360c6305503b85fe6' 
  AND token = 'spa1Xyu3Kthcb0Hz228Y0t0jH5m5qfjs2wnQW28UeeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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