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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5c21a6de07079b6c8300dc1614f9b0331c5f2a8bc1b847ed6ecdab31505484' 
  AND token = 'dpjUC8RPzzJd1twSPe6NMKo3wpphEImlaPIfdACY8ZU=' 
  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"
    }
  }
}