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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a629ecadff13935e403bb95018747dfb16b4cd840370897ac882f7d66f18bdd' 
  AND token = 'r/67ae2f99ZQTLnM8A8oq6G7w8f1k/84dO30rL4FZAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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