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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900a9903f0b0bca5072f8f31f84298e96e8b8566d96ee776e1e0c8509e793016' 
  AND token = 'pXld2EGCIhrMLWfHHKDpxFLWFg0LkhLtACfAnuwiFkU=' 
  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"
    }
  }
}