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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0c31a9eb69ffe4b24f216d92764efdec0d2385ca0b87b54c69b28fdae81443' 
  AND token = '3IC7VYrMZ33NnqnGz2qqM5d/0di/gjwkc4TllfZW/wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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