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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b06c8cc20d42139650d8197f284e60403d62dd4e8980968667a5c2a3f1da7c5' 
  AND token = 'lOrRw7RwomEs7tP/9Sxd67yxGt55yub8/rqvrO3gehE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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