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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d1114e0e18d2777a71b35d3c73463b91d7999b8a953624723b42781a2d14119' 
  AND token = 'QqD/hyNZa3EN6zLBD66qUZbB688bqTU8b15XDSjz29g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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