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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02168d6b78d531b0da61b8b345d54f3c057595b111339ac356fb8596a23ebe46' 
  AND token = 'slie/NyCgaJ9ymttBpnwqJ3qnpzt+FsIvyjkbToFUPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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